Universally adjustable tool mount requiring single operating handle



May 2, 1950 P. F. CARLSON UNIVERSALLY ADJUSTABLE TOOL MOUNT REQUIRING SINGLE OPERATING HANDLE- 3 Sheets-Sheet 1 Filed Sept. 21, 1948 INVENTOR. Paul F.Curlson.

ATTORNEY May 2, 1950 P F. CARLSON Filed Sept. 21, 1948 SINGLE OPERATING HANDLE Fig.4.

3 Sheets-Sheet 2 JNVENTOR. Poul F.0urlson.

ATTORNEY y 2, 1950 P F CARLSON 2,50,440

UNIVERSAELY ADJUSTABLE TOOL MOUNT REQUIRING SINGLE OPERATING HANDLE Filed Sept. 21, 1948 Sheets-Shet 3 Fig.5.

IN VEN TOR.

Poul F.Corlson. 31 6 ATTORNEY Patented May 2, 1950 UNIVERSALLY ADJUSTABLE 'TOOL MOUNT REQUIRING SINGLE OPERATING HANDLE Paul Ecarlson, Madison, Pa.

Application September 21, 1948, Serial No. 50,330

11 Claims.

My invention relates to a universal positioning vise that is adapted for mounting and firmly holding any object within its capacity in any desired location and angular position that may be necessary in order to work conveniently on the object, and at the same time enabling the object to be quickly adjusted from one position to another and firmly held in the adjusted position.

An object of the invention is to provide a supporting structure for such vise for holding the vise firmly in any desired position, and, without dismounting the vise structure, permitting quickly adjusting it to any other desired position and firmly clamping it in such position.

1 A further object of the invention is the provision of a supporting structure for such vise including a series of members between the supporting base and the vise each extending at right angles to the member supporting it and movable about an axis at right angles to the axis of its supporting member, together with clamping means between each successive member in the series and the member supporting it, together with a. single controlling means for simultaneously tightening or loosening the several clamping means.

In accordance with the illustrated embodiments of the invention, a vise is mounted on a structure including three shafts connected in "series, each extending at right angles to the member supporting itso that the vise is adapted to move in three planes, each at right angles to the axis of the associated supporting shaft.

Other objects of the invention will be apparent from the following description of certain preferred embodiments of the invention, reference being had to the accompanying drawing, in

which:

Figure 1 is a perspective view of a universal positioning vise constructed in accordance with one embodiment of my invention,

Fig. 5 is a view in vertical section showing the The vise, indicated generally 2 erated clamping means with the cam in its clamping position. 1

Referring tothe drawing and particularly to Figs. 1 and 2 thereof, a supporting base or bar I is provided which serves as a supporting member for the entire structure by means of which the universally positioned vise of my invention may be supported in a working position in any convenient manner, such as in the jaws of a regular bench vise. A bore 2 is provided through the upper end of the bar I for receiving a drawbar or shaft 3 having a screw threaded end 4 extending through the bore 2 and provided with a shoulder 5 for limiting the movement of the drawbar 3 toward a surf-ace 6 of the bar I. .A steel nut 1 is provided with a screw threaded bore 8 for receiving the screw threaded end 4 of the shaft 3. The nut I is provided with a shoulder or end portion 9 that engages a surface H! of the supporting bar I. An operating handle or lever I l is provided extending through an opening in the nut 1 for tightening or loosening the nut 1 on the shaft 3.

A clamping sleeve I2 is provided having a bore l3 for receiving an enlarged cylindrical outer end [4 of the drawbar shaft 3. The inner end of the sleeve l2 extends beyond the shoulder 5 of the drawbar shaft 3 so as to engage the surface 6 of they supporting bar l before the shoulder 5 engages that surface when the drawbar shaft 3 and the clamping sleeve l2 are moved together toward the left, as viewed in Figs. 1 and 2. A bore I6 is provided through the opposite sides of the clamping sleeve l2. When-the device is assembled, the bore lfiand a bore l5 that extends through the enlarged outer end of the drawbar shaft 3 are in alignment.

A split clamping shaft 2! is provided and comprises a lower cylindrical portion 22 of such diameter as to conveniently slip through the bores I5 and 16 when these bores are in alignment. An upper portion 23 of the shaft 2| is enlarged and provided with a reamed bore 24 therethrough. A bore 25 of smaller diameter than the bore 24 is provided through the lower end of the shaft 2| and a slot 26 extends between the bores 24 and 25, thus permitting the two side portions on the opposite sides of the slot to be squeezed toward each other to reduce slightlythe size of the bore 24. A groove 21 is provided at the lower end of the shaft 2| for receiving a spring retaining ring 28 for holding the shaft 21 in place on the drawbar 3. v v

at 32, includes a jaw 33mounted on a rod 3| which. extends 3 through the bore 24 in the split clamp shaft 2|. A jaw 34 is provided having a bore 35 therethrough for permitting the screw threaded end 36 of the rod 3| to extend through the jaw and to be received in a screw threaded bore 31 of a nut 38 for moving the jaws 33 and 34 relative to each other. A lever 39 is provided for operatin the nut 38. A heel screw 4| is provided on the lower portion'of the jaw 34 and is adapted to extend through a bore 32 in the lower portion of the jaw 33 and to space the jaw 33 with respect to the jaw 33 by the setting of-a nut 33 that is screw threadedly positioned upon the heel :screw When it is desired to position the vise 32in any desired position, the steel -.nut loosened on the end of the screw threaded drawbar shaft 3 and the Vise 32 is then free to move to any position. When the steel wit 1 is loosened, the drawisbar rshaft 13 is "free to move a about its horizontal axis, the cylindrical split clamp-shaft 2|"is'free -:to move about its vertical axisand the vise supporting shaft 3| is free to move about its horizontal-axis, thus allowing the vise 32 to be rotated inthree planes about any one or 1 more :of the rthree axes of the three. shafts sup'porting'it. .The -vise 32 .may, therefore, be moved to any desired angular positionso that-:t'he surface of the. object ih'eld'between thejaws of thevise may be inclined at any desired angle, .moved upside down, reversed, or otherwise adjusted to any convenient ipos'ition to be worked upon.

When adjusted to the desired position, the steel .:nut is turned to tighten'the several connections lbetween thesupporting members whichincludes "ithe connectionbetween the base .bar i and 'the '-'bores 15 and lfi in theshaft 3 and theclamping sleeve |2, respectivelyfthusforcing the clamping sleeve-12 toward the left, as viewed in Figs. 1 ana-2 totightly engage 'the surface 6 or" the supporting bar and to bring the-end 9 of the nut! tig'litlyagainst-the surface |3 of the bar thus clamping the bar between theouter-end 36f *thesteel nut] and the innerend- I l-of' the clamp- -ingsleeve |2. This clamping action prevents movement of the drawbar shaft -3 -about its axis. This movement of i the drawbar shaft -3 also squeezes the split clampshaft 2| to prevent it from moving about its axis within the bores |5 and'lli. This clamping *or squeezing action of thesplit clamp shaft 2| also, in effect, reduces "the'size of the bore-24'so'as to clamp tightly about the 'supporting shaft 3| and prevent this shaft from rotating about its axis. Thus all three 'adjustable members, the drawbar shaft 3, the-split clamp -shaft2l, and'the supporting shaft 3| are '"cla'mped-against rotation about their respective axes 1 by a single operating 'member, namely the steel-nutt 'astructure' in its essential characteristics is similar tothe embodiment shown in Figs; 1 and 2, except for the means for clamping and unclamping the several shafts of the vise supporting structure against rotation. The supporting structure comprises a supporting base 5! which is shown in a form that may be held in the laws of a regular bench vise, but any other convenient form of supporting base may be used, such as a base mounted directly on a bench. The upper end of the base 5| terminates in a circular head'porticn 52 having abore 53 extending therethrough.

A drawbar shaft 54 is provided having a por- '-tion 55 that is relatively smaller in diameter and,

a portion 56 that is relatively larger in diameter. The endof the smaller portion is provided with screw threads 5? for engaging internal screw threads 53 in the opening of an adjusting nut 59. When the structure is assembled, the screw threaded end of th'e drawbar shaft 54 extends loosely through the bore 53 in the circular head portion 52 of the supporting base member 5| and also'looselythrough a b01 85 i in a cradle 32. The cradle '62 is provided on one side with a fiatsurface that engages the adjacent fiat surface-of 'the'head portion 52 of the-supportingI-base member, and is provided on its "opposite side with :a concave cylindrical curved surface 33 for receiving curved portions 540i a-locking cam indicated generally attfi. The curvedsurface 63 and the curved portions 34 of the locking cam'are circular aor'cylindrical in shape'about the center of move- -ment ofthe .cam'so that the surface of the cam maymove smoothly along the curved1surfacefi3. A portionrt i of the surface rofxthecam provides a lowt-arearelatlvely neari-the'center of movement of' the cam. A portionfiB of' thesurface .of the cam provides ahigharea of Ethe cam that is'more remote from the centerrof the'movement of'the :cam thanisthelow area. .As best shown in'iFig. 4, the locking cam member .ccmprisesza' bifurcated bracketfi'i carrying 'twocams E5 spaced apart and adaptedto'be positioned on opposite sides of'the drawbar shaft 54. An operating lever 69 .is provided for operating the locking cams 65.

The supporting structure shown in Figs. 3 and l includes a clamping sleeve ii having a longitudinal bore i2 for fitting over"the 'large'end'zfifi ofthe drawbar shaft-'53 and-is also provided with two transverse bores 13 onopposite sides thereof registering with abore hi 'in the drawbar shaft 56. A split clamping shaft l5 is provided having a relatively smaller cylindrical end 13 and a larger cylindrical end Tl. The lower end extends throughand is supported in the bores '|3-and'14. A bore 53 is provided transversely through'the larger'end of the shaft 15 and a bore 19 is providedtransvers'ely through the-lower end ofthe shaft-E5. These two bores are connected'by a-slot 8| extending between them. A groove 82 is provided about the lower endof'the shaft -*'|5 for receiving a retaining ring sermon the-shaft 15 in position when-assembled. The bore-l8 in the -shaft 25 receives the end of-a supporting shaft.

.A'pair of cooperating jaws 8'5 andf86 is'provided, the jaw 85'being supported on the shaft 84. The other jaw 86 is supported by means of two slide rods 31 and 88fastened to the jaw 86 and extendingthrough bores 89 and 9|, respectively, in the jaw 85. A screw threaded shaft 92 is attached to the jaw.85 and cooperates with a screwthreaded bore 93 in the'shaftt l'to move the jaw 85 relative-to the jawl85. .An operating head 3M- is provided on the outer end .ofthe shaft 92 andan-operating lever fi 5 extends through a bore in'thehead-M for rotating the head: and

shaft 92.

1 The operation of the locking cam will be clearly understood by reference to Figs. 5, 6 and 7. With the cam lever 69 and cam 65 in the position illustrated in Figs. 5 and 6, the low portion 96 of the cam is in such position as to engage the adjusting nut 59 if the adjusting nut is moved into engagement with the cam. The adjusting nut 59 is then moved close to the cam without bringing pressure to operate the drawbar shaft 54. A set screw 95 is provided for locking the adjusting nut 59 on the screw threaded end 51 of the shaft 54. When the cam 55 is in the position shown in Figs. 5 and 6, the connections between the-several shafts comprising the supporting structure are relatively loose, so that the vise may be moved to any desired position as above described. When the desired position of the vise has been established, the lever '69 is moved downwardly to theposition shown in- Fig. 7, so that the portion of the cam engaging the surface of the adjusting nut 59 moves it toward the left, as viewed in Figs. 5, 6 and 7. This causes the drawbar shaft 54 to be moved toward the left, thus moving the clamping sleeve ll into tight engagement with one side of the head 52 to prevent rotation of the shaft 54 about its axis. In the same manner as described above with respect to; the embodiment of the invention shown in Figs. 1 and 2, .the clamping sleeve H tightly engages the split clamp shaft preventing it from moving about its axis and the bore 18 in the upper end of the split clamp shaft 15 is tightly clamped about the supporting shaft 84 to thus prevent it from movement about its axis, thus locking the vise in its adjusted position.

The cradle 62, the cams 65 and the lever 69 may .be moved as a unit about the axis of the drawbar shaft 54, so that the lever 69 may operate on the one side or the other of the axis of the shaft 54 instead of above the axis of the shaft as illustrated. This is an added convenience when the vise is in a position bent back adjacent the supporting base 5|.

' Also, if desired, the cradle 62 may in certain cases be omitted and the cams 65 positioned between the head 52 of the supporting base and the adjusting nut 59 in direct contact with both. One or' the other of these two members may be curved to receive the curved surfaces 64 of the cams 65 to thus more positively hold the cams in the desired position.

It will be apparent to those skilled in the art that modifications may be made in the specific structures illustrated and described within the scope of my invention, and I do not wish to be limited otherwise than in accordance with the appended claims.

I claim as my invention:

1. In a universal positioning tool, a supporting structure for the tool comprising a supporting base member provided with a head having a bore therethrough, a drawbar shaft having an inner end extending through the bore in the head, clamp operating means attached to the inner end of the drawbar shaft and operative for frictionally clamping the parts of the tool supporting structure to prevent relative movement of its parts, a clamping sleeve surrounding the outer end of the drawbar shaft, the outer ends of the drawbar shaft and clamping sleeve having bores of the same size extending transversely therethrough, a split clamp shaft extending through the bores in the clamping sleeve and drawbar shaft, said split clamp shaft having an adjustable 6 sized bore extending transversely. therethrough a supporting shaft havingone end positioned through the variable sized bore, and .a .tool mounted to be carried by the. supporting. shaft.

2. In a universal positioning tool, a supporting structurefor the tool comprisinga supporting base member provided with a head having a bore therethrough, a drawbar shaft having an inner end extending throughv the bore in the head, clamp operating means attached to the inner end of the drawbar shaft and operative for frictionally clamping the parts of the tool supporting structure to prevent relative movement of its parts, a clamping sleeve surrounding the outer end ofv the drawbar shaft, the outer ends of the drawbar shaft and clamping sleeve having bores of the same size extending transversely therethrough, a split clamp shaft extending through the bores in the clamping sleeve and drawbar shaft, said split clamp shaft having an adjustable sized bore extending transversely therethrough, a supporting shaft having one end positioned through the variable bore, and a tool mounted to be carried by the other end of the shaft, said clamp operating means being operable to a clamping position to force the clamping sleeve tightly against the head of the supporting base member to bind the drawbar shaft against rota tion about its axis, to simultaneously squeeze the split clamp shaft within the bores in the drawbar shaft and the clamping sleeve to clamp the split clamp shaft against movement about its axis, and to simultaneously reduce the size of the bore in the split clamp shaft about the tool supporting shaft to clamp the tool supporting shaft against movement about its axis.

3. In a universal positioning tool, a support ing structure for the tool comprising a supporting base member provided with a head having a bore therethrough, a drawbar shaft having an inner end extending through the bore in the head, clamp operating means attached to the inner end of the drawbar shaft and operative for fric-" tionally clamping the parts of the tool supporting structure to prevent relative movement of its parts, a clamping sleeve surrounding the outer end of the drawbar shaft, the outer ends of the drawbar shaft and clamping sleeve having bores of the same diameter extending transversely therethrough, a split clamp shaft extending through the bores in the clamping sleeve and drawbar shaft, said split clamp shaft having'a' variable sized bore extending transversely there'- through, a supporting shaft having one end POSi-i tioned through the variable bore, and a toolmounted to be carried by the other end of the shaft, said clamp operating means being operable to a clamping position to force the clamping sleeve tightly against the head of the supporting base member to bind the drawbar shaft against rotation about its axis, to simultaneously squeeze the split clamp shaft within the bores in the drawbar shaft and the clamping sleeve to clamp the split clamp shaft against movement about its axis, and to simultaneously reduce the size of: the bore in the split clamp shaft about the tool supporting shaft to clamp the tool supporting shaft against movement about its axis, the clamp operating means comprising a nut screw thread-' edly attached to the end of the drawbar shaftand positioned to engage one side of the head of the supporting base member for forceably mov-y ing the drawbar shaft with respect to the head of the supporting base member.

,4. In a. universal po in to asuvnqrte anemia higtstmeture for the -.too1.-comprising a support.- inghase membereprovided with ahead having a haze .therethrough, .a ldrawbarishatt having .an inner.endlextendingethrough;the;bore in thehead,

selamp operating means attached :toithe inner end :ofithe drawbartshait and operative .for trio.- :tionally clamping the .partsiof the tool supporting Vzstructure .toiprevent relative movement of .its parts, a ..clamping sleeve'suntounding the outer end of ethe drawbarushaft, :the. outer .ends of the Ydrasvbar shaft andlclamping sleeve having ..bores .of thesame size extending transversely there.- tnrough a. split .clamp shaft extending through the :bores in the clamping sleeve and drawbar shaft, said split "clampsv shaft .having a variable sized hore extending transversely therethrough, vagsupporting shaft having :one :end ..positioned through the variable bure u-and a tool mounted 'totbe carried by -:the other end of the shaft, said .elamp eoperating means being operable to a clamping position to force the clamping sleeve tightly vagainst thelhead -oi the supporting-base member ztOlbll'ld the .idrawbar shaft against rotation aboutiits axis, to simultaneously squeezethe split clamp shaft within theibores. in the draw- "bar .shaft .and \the .clamping sleeve .4110 lclamp the split glamp shaft against movement about its a.xis,.and :to simultaneously reduce the size of the bore in the sp1it:clamp rshaitiabout the tool suplJQrting shaft 'to .clamp the tool supporting shaftagainst mavementabout itsiaxis, the .elamp .QDeratingmeansnomprising.aclampingrnutscrew thteadedly: attached-to .the inner end of the drawhar-jshaft, :a saddle hetween the head (of the supporting member and-theclamping =nut, a cam operatively positioned between the'clamping nut and :thesaddleafor iforceably moving the .drawbar shaft. with respect-to ithe head .of supporting base mem .5. 1In a universal positioning :tool, a supporting .Structure. for the 17001 comprising -a supporting haseimember providedwith a .headhaving a bore therethrough, a drawbar =shaft having an inner end .e rtendingothrough .the :bore, in ithe-head and an outer endof larger diameter than-the-inner end, i a clamping sleeve. surrounding "the outer end of ;the drawbar shaft and being longer than the outer end .portionof the :drawbar shaft so as to extend inwardly. beyond the -part of -:the 'drawharkshaft of largeridiametergthe outer ends of the drawbar shaft and -clamping sleeve having bores aof the .-same size extending transversely therethrough, a split clamp shait having a-lovver endtextending through the boresin theclamping sleeveiand drawbar shaft, said split olarnp' shaft having an upper .endof 'larger di-ameter than the lowereenda-variable sized bore extending transi iersely throughthe upper end-of thesplit clamp shaft, -a supporting shaft having one end positioned-within the variable bore,and a-too1 mounted to be carried by the supporting shaft, and clamp operatingmeans'attaehed to {the inner end efthe draw-bar shaft and operative for frictionall-y clamping the parts of the tool supporting structure to prevent relative movement of its parts.

- 6. In a universal positioning tool, a supporting structure for the tool comprising a supporting base member provided with a head having-a bore therethrough, p a drawbar shaft having an inner end :extending through :the -bore in the head and an outer end of larger diameter--than -the inner .endaelamping sleeve surrounding the .outer end of the drawbar shaft, "the clamping-sleeve :being longen-tha-n the outer endportion of the drawbar shaft sou-a5 to-.;e2de nd inwardly beyond the part sofa/he drawbar shaft ofylarger diameter, the-oute ends of the iglrawbar shaft and clamp n sleeve having bones f t e s me size extend n trans: verse y therethrou h, a sp t lamp .-s a t haw ins :a lower e d ext ndin t u h th b xes in the .cl m ins s eve and d aw shaft said plit clamp h fte avi ean up e nd of :l erid amr v te tha the l wer end anadiu ab es ed xtendin t ansver el hrone-.1 h upper ene-.-q the s t lamp-sha t a up o tin shafiiha es su end PQ ii0nQ roug th var e he e; a hee mu tedw fle r ed-z y the o h ndpjf th shaft nd clamp Q ra in means te hesi t th i n r end 9 th d awe Sha t n eerebi we l m na ti n a h el meies slee e ht y a ainst t ead of e sup.- ev ti b s membe t b n s fawb sh t; a a o ai e eheu M8 t im l aneous 4 e e Hh n t e e sha th n th wa t e thefdravlbar shaft and the clamping sleeve to clemprlthe s t clamp af ag ns mowe about its}ax @nd "to simultaneously reduces-the size pfthe herein the split clamp. shaft i about the toolsupporting shaft :to clamp the tool support,- ing shaft againstLmovem'nt about its axisthe e'l amp operating means comprising a .nutserew threadedlyfattachedtothe end of the drawbar shaft and positioned to engage one -.'s ide of Qtlji'e head of the supporting base member for lforceably moving the drawbar shaft with respectfltoflthe head of the supporting lbase member. '7. In a universalpositioning tool, ,a supporting structure for the tool .eomprising' a supporting basemember provided \uith'a heafd having' a bore therethrough, a draw bar vsha'it having an inner end extending lthrough the boreiin, the head and an outer ,end of larger diameter than the inner end a olampingsleeve surrounding 'the outer lend of bhe-drawbar shaft, the clamping sleeve being longer than Pheouter lend portioniof the draw;- bar shaft so as to extend inwardly .beyond the part of the 'drawbar shaft of larger diameter, the outer ends o t e cl awha sh a d clampin leeveihav ne es o the sam si e te din ra ve se the eth ou 'h a sp t d mn havin allowe an t end ng through e? in the clamping sleeve and'drawbar shaft,

splitgclamp'shalfthaving an upper end of jlarger diameter than the lower end; an'adjustable sized bore extending transversely through the upper end of the splitclamp shaftj-a supporting'shaft having one endpositi'oned-through the adjustable sized bore, a tool-mounted :to be carried by th'e other lend of .the shaft, and .clamp operating ha e a nst retationebou t x swto simu taneously squeeze =the split clamp shaft within the rboresin the drawbar shaft and the elamping s eev to amp t s l a shaft a inst movement about its axis, and to simultaneously redupethe size of the adjustable b re. inthe. split clamp shaft about the-tool supporting shaft to clamp the tool supporting shaft against movementaboutitsaxis, the elamp operating means eomprisinga clamping nut screw threadedly attaehed to the v inner end of the drawbar. shaft, g1, eampperatively posltip ned between? the clamping nut. and the head of the supporting member for forceablymovingithe drawbar shaft withmespect to the i head of "the supporting base member.

:8. zIn. aiuniversalzpqsitioningetoo1,,a ;support1ng structure for the tool comprising a supporting base member provided with a head having a bore therethrough, a drawbar, shaft having an inner end extending through the bore in the head, a clamping sleeve surrounding the outer end of the drawbar shaft, the outer ends of the draw bar shaft and clamping sleeve having bores of the same size extending transversely therethrough, a split clamp shaft extending through the bores in the clamping sleeve and drawbar shaft, said split clamp-shaft having an adjustable sized bore extending transversely therethrough, a supporting shaft having one end'positioned through the variable bore, a tool mounted to be carried by the supporting shaft, and clamp operating means attached to the inner end of the drawbar shaft and operative for moving the drawbar shaft with respect to the supporting base head for causing frictional engagement between the clamping sleeve and the head, and betweenthe clamp sleeve, the drawbar shaft and the clamping sleeve, and between the clamp sleeve and the supporting shaft to clamp these several parts of the tool supporting structure against relative movement.

9. In a universal positioning tool, a supporting structure for the tool comprising a supporting base member provided with a head having a bore therethrough, a drawbar shaft having an inner end extending through the bore in the head, clamp operating means attached to the inner end of the drawbar shaft and operative for frictionally clamping the parts of the tool supporting structure to prevent relative movement of its parts, a clamping sleeve surrounding the outer end of the drawbar shaft, the outer ends of the drawbar shaft and clamping sleeve having bores of the same size extending transversely therethrough, a split clamp shaft extending through the bores in the clamping sleeve and drawbar shaft, said split clamp shaft having a variable sized bore extending transversely therethrough, a supporting shaft having one end positioned through the variable bore, and a tool mounted to be carried by the other end of the shaft, said clamp operating means being operable to a clamping position to force the clamping sleeve tightly against the head of the supporting base member to bind the drawbar shaft against rotation about its axis, to simultaneously squeeze the split clamp shaft within the bores in the drawbar shaft and the clamping sleeve to clamp the split clamp shaft against movement about its axis, and to simultaneously reduce the size of the bore in the split clamp shaft about the tool supporting shaft to clamp the tool supporting shaft against movement about its axis, the clamp operating means comprising a clamping nut screw threadedly attached to the inner end of the drawbar shaft, a cam operatively positioned between the clamping nut and the head of the supporting member for forceably moving the drawbar shaft with respect to the head of the supporting base member, said cam having a handle extending in a direction generally parallel to the axis of the drawbar shaft, the cam and handle being free to move about the axis of the drawbar shaft and operable in any position with respect to the axis of the drawbar shaft to move the drawbar shaft for clamping or unclamping the parts of tool supporting structure.

10. In a universal positioning tool, a supporting structure for the tool comprising a supporting base member provided with a head having a bore therethrough, a drawbar shaft having an in- 10 ner end extending through the bore in the head, a clamping sleeve surrounding the outer end of the drawbar shaft, the outer ends of the drawbar shaft and clamping sleeve having bores of the same size extending transversely therethrough, a split clamp shaft extending through the bores in the clamping sleeve and drawbar shaft, said split clamp shaft having a variable sized bore extending transversely therethrough, a supporting shaft having one end positioned through the variable bore, a tool mounted to be carried by the other end of the shaft, and clamp operating means attached to the inner end of the drawbar shaft and operable to a clamping position to force the clamping sleeve tightly against the head of the supporting base member to bind the drawbar shaft against rotation about its axis, to simul-,

taneously squeeze the split clamp shaft within the bores in the drawbar shaft and the clamp-f ing sleeve to clamp the split clamp shaft against, movement about its ,axis, and to simultaneously reduce the size of. the bore in the split clamp shaft about the tool supporting shaft to clamp the tool supporting shaft against movement about its axis, the clamp operating means comprising a clamping nut screw threadedly attached to the inner end of the drawbar shaft, a saddle between the head of the supporting member and the clamping nut, a cam operatively positioned between the clamping nut and the saddle for forceably moving the drawbar shaft with respect to the head of the supporting base member, said cam having a handle extending in a direction generally parallel to the axis of the drawbar shaft and operable toward or away from the drawbar shaft for operating the cam in the one or the other direction to clamp or unclamp the parts of the tool supporting structure, the cam having a high area thereon so positioned as to clamp the parts of the supporting structure when the handle is moved inwardly toward the drawbar shaft and to unclamp the parts of the supporting structure when the handle is moved outwardly away from the drawbar shaft.

11. In a universal positioning tool, a supporting structure for the tool comprising a supporting base member provided with a head having a bore therethrough, a drawbar shaft having an inner end extending through the bore in the head, clam operating means attached to the inner end of the drawbar shaft and operative for frictionally clamping the parts of the tool supporting structure to prevent relative movement of its parts, a clamping sleeve surrounding the outer end of the drawbar shaft, the outer ends of the drawbar shaft and clamping sleeve having bores of the same size extending transversely therethrough, a split clamp shaft extending through the bores in the clamping sleeve and drawbar shaft, said split clamp shaft having a variable sized bore extending transversely therethrough, a supporting shaft having one end positioned through the variable bore, and a tool mounted to be carried by the other end of the shaft, said clam operating means being operable to a clamping position to force the clamping sleeve tightly against the head of the supporting base member to bind the drawbar shaft against rotation about its axis, to simultaneously squeeze the split clamp shaft within the bores in the drawbar shaft and the clamping sleeve to clamp the split clamp shaft against movement about its axis, and to simultaneously reduce the size of the bore in the split clamp shaft about the tool supporting shaft to clamp the tool supeerting shaftagainst movement about its axis, theelamp operating means comprising a clamping'nutscrew threadedly attached to the inner end of the drawbar shaft, a saddle between the headof thesupporting member and the clamping nut, a cam operatively positioned between the clamping nut and the saddle for forceablymoving the drawbar shaft with respect to the head of the supporting base member, said cam having a handle extending in; a direction generally;

paraiiel to the axis of the di'awbar shaft and operable toward oraway from thedrawbar shaft for operating the cam-in the-one or the other direction to clamp orunclamp the parts of the tool supporting structure, the-6am having a high areathereon so positioned as t'o clamp the parts ojj the supporting strueture when the handle is mpvecl inwardly toward the drawbarshaft and to unclarnp the parts of" the supporting structure. when the handle is; meveoloutwardly away from the drawbar shaft, the saddle, cam and cam handle being free to move as a unit about the 12 axis of the drawba-r shaft and operable in any position about the drawbar Shaft'for clamping or unclamping the parts of the toolsupportlng structure.

PAUL F; CARLSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 791*,37'6' Schneider n Aug. 15,1905 943,573 Simon Dec. 14, 1909 1,012,383 Lyhne Dec. 19, 1911 1,273,319 Blakely July 23', 1918 1,410,608 Schroth Mar. 28, 1922- Number Country Date:

218,430 Germany: v Jan. 28, 1910 

